How to change ios volume in swift with help UISlider

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The MPVolumeView class is designed to let you do exactly this. It’s in MediaPlayer framework. So, add that to your app to make things build correctly.

You create it and make it visible the way you instantiate any other subclass of UIView, which you probably know by now.

You can provide your own frame and use this to change the system volume.

var wrapperView = UIView(frame: CGRectMake(30, 200, 260, 20))
self.view.backgroundColor = UIColor.clearColor()
self.view.addSubview(wrapperView)

// 3
var volumeView = MPVolumeView(frame: wrapperView.bounds)
wrapperView.addSubview(volumeView)

For more help you can look here Controlling system volume using swift